Dimethyl sulfone exists in all living organisms, ranging from bacteria to humans.

2′-Deoxyadenosine 5′-monophosphate disodium, a nucleic acid AMP derivative, is a deoxyribonucleotide found in DNA. 2′-Deoxyadenosine 5′-monophosphate disodium can be used to study adenosine-based interactions during DNA synthesis and DNA damage.

4-Guanidinobutyric acid is an L-arginine metabolite that has been used in the intestinal transport tranport studies.